Ultimate Arms Gear Tactical Heckler & Koch H&K HK G3 MP 5 MP5 Deluxe See Thru STANAG Rail Claw Scope Sight Mount Clamps Directly To Top of Receiver Matte Black Finish - Aircraft Grade Aluminum Construction. Stanag Dimension Will Accept Stanag scopes, Standard Weaver And Picatinny (7/8") Attachments : Sights - Lasers - Lights Etc. Mount Clamps Directly To Top of Receiver. Features 12 Slot Rails. See Thru Feature Allows View Of Your Iron Sights. Once Piece Claw Mount- Easy No Gunsmithing Installation !